As soon as the application is executed, it checks if a Monitor is connected or not. If a monitor is already connected, then it starts up the following options as shown in the following figure to choose from (KC705).
Selecting either r or s puts the system in Pass-Through
mode, where the Video received by RX is forwarded to TX. This configures the
vid_phy_controller and sets up the DisplayPort for RX. If a
DisplayPort Source (for example, GPU) is already connected to DP RX, then it starts the
training. Else, the training happens when the cable is plugged in. As soon as the
training is completed, the application starts the DP TX Subsystem. The video should be
seen on the monitor once the TX is up. The previous figure shows the UART transcript.
The transcript might differ based on the training done by GPU.